Handle dimensions with no variance better (i.e. ignore them).
Handle dimensions with no variance better (i.e. ignore them).

ajjl/mlpack,palashahuja/mlpack,ajjl/mlpack,ranjan1990/mlpack,ajjl/mlpack,darcyliu/mlpack,darcyliu/mlpack,ranjan1990/mlpack,darcyliu/mlpack,palashahuja/mlpack,ranjan1990/mlpack,palashahuja/mlpack